ADTRAN ESU 120e user manual Power Connection, Ground ING Instructions

Chapter 2. Installation

Power Connection

Power is supplied to the ESU 120e through a IEC-type power con- nector on the rear of the unit.

Power to the ESU 120e must be from a grounded 90-240 VAC, 50/60Hz source.

GROUND ING INSTRUCTIONS

Grounding instruction information from the Underwriters' Labora- tory UL 1950 3rd Edition is provided in this section.

An equipment grounding conductor that is not smaller in size than the ungrounded branch-circuit supply conductors is to be installed as part of the circuit that supplies the product or system. Bare, cov- ered, or insulated grounding conductors are acceptable. Individu- ally covered or insulated equipment grounding conductors shall have a continuous outer finish that is either green, or green with one or more yellow stripes. The equipment grounding conductor is to be connected to ground at the service equipment.

The attachment-plug receptacles in the vicinity of the product or system are all to be of a grounding type, and the equipment grounding conductors serving these receptacles are to be connected to earth ground at the service equipment.

A supplementary equipment grounding conductor shall be installed between the product or system and ground that is in addi- tion to the equipment grounding conductor in the power supply cord.

The supplementary equipment grounding conductor shall not be smaller in size than the ungrounded branch-circuit supply conduc- tors. The supplementary equipment grounding conductor shall be connected to the product at the terminal provided, and shall be connected to ground in a manner that will retain the ground con- nection when the product is unplugged from the receptacle. The connection to ground of the supplementary equipment grounding conductor shall be in compliance with the rules for terminating bonding jumpers at Part K or Article 250 of the National Electrical

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